-al -er a-a a-b aaa aab aae aaf aag aal aar aas ab- aba abb abe abf abg abl abr abs aea aeb aee aef aeg ael aer aes af- afa afb afe aff afg afl afr afs ag- aga agb age agf agg agl agr ags al- ala alb ale alf alg all alr als ar- ara arb are arf arg arl arr ars as- asa asb ase asf asg asl asr ass baa bab bae baf bag bal bar bas bba bbb bbe bbf bbg bbl bbr bbs be- bea beb bee bef beg bel ber bes bfa bfb bfe bff bfg bfl bfr bfs bga bgb bge bgf bgg bgl bgr bgs bla blb ble blf blg bll blr bls bra brb bre brf brg brl brr brs bsa bsb bse bsf bsg bsl bsr bss eaa eab eae eaf eag eal ear eas eba ebb ebe ebf ebg ebl ebr ebs eea eeb eee eef eeg eel eer ees ef- efa efb efe eff efg efl efr efs ega egb ege egf egg egl egr egs ela elb ele elf elg ell elr els era erb ere erf erg erl err ers es- esa esb ese esf esg esl esr ess faa fab fae faf fag fal far fas fba fbb fbe fbf fbg fbl fbr fbs fea feb fee fef feg fel fer fes ffa ffe fff ffg ffl ffr ffs fga fgb fge fgf fgg fgl fgr fgs fla flb fle flf flg fll flr fls fra frb fre frf frg frl frr frs fsa fsb fse fsf fsg fsl fsr fss gaa gab gae gaf gag gal gar gas gba gbe gbf gbg gbl gbr gbs ge- gea geb gee gef geg gel ger ges gfa gfb gfe gff gfl gfr gfs gga ggb ggg ggr ggs gla glb gle glf glg gll glr gls gra grb gre grf grg grl grr grs gsa gsb gse gsf gsg gsl gsr gss la- laa lab lae laf lag lal lar las lba lbb lbe lbf lbg lbl lbr lbs lea leb lee lef leg lel ler les lfa lfb lfe lff lfg lfl lfr lfs lga lgb lge lgf lgg lgl lgr lgs lla llb lle llf llg lll llr lls lra lrb lrf lrg lrr lrs lsa lsb lse lsf lsg lsl lsr lss ra- raa rab rae raf rag ral rar ras rba rbb rbe rbf rbg rbl rbr rbs re- rea reb ree ref reg rel rer res rfa rfb rfe rff rfg rfl rfr rfs rga rgb rge rgf rgg rgr rgs rla rle rlf rlg rll rlr rls rra rrb rrf rrg rrl rrr rrs rsa rsb rse rsf rsg rsl rsr rss saa sab sae saf sag sal sar sas sba sbb sbe sbf sbg sbl sbr sbs se- sea seb see sef seg sel ser ses sfa sfb sfe sff sfg sfl sfr sfs sga sgb sge sgf sgg sgl sgr sgs sla slb sle slf slg sll slr sls sr- sra srb sre srf srg srl srr srs ss- ssa ssb sse ssf ssg ssl ssr sss